<template>
  <div class="cartcontrol">
    <div class="cart-decrease"
         v-show="food.count>0" @click.stop.prevent="decreaseCart" transition="move" >
      <span class="inner icon-remove_circle_outline"></span>
    </div>
    <div class="cart-count" v-show="food.count>0">{{food.count}}</div>
    <div class="cart-add icon-add_circle"
    @click.stop.prevent="addCart"></div>
  </div>
</template>

<script type="text/ecmascript-6">
  // 引入全局的vue 然后用来设置 vue.set
  import Vue from 'vue';

  // 创建关联的 需要传入一个food ，用来关联 购买个数 多少。需要从父级中传入
  // food 跟goods.vue相关联 父组件中传入，如果food改变，相应的对象也会发生改变
  // <cartcoutotrol :food="food"></cartcoutotrol>-
  export default {
    props: {
      food: {
        type: Object
      }
    },
    created() {
    },
    methods: {
      // 点击事件
      // 新增商品
      addCart(event) {
        if (!event._constructed) {
          return;
        }
        // console.log('click');
        if (!this.food.count) {
          // 这样写 vue检测不到 需要使用vue.set
          // this.food.count = 1;
          Vue.set(this.food, 'count', 1);
        } else {
          this.food.count++;
        }
        // 派发事件 cart.add  参数event.target
        this.$dispatch('cart.add', event.target);
      },
      // 减少商品
      decreaseCart(event) {
        if (!event._constructed) {
          return;
        }
        if (this.food.count > 0) {
          this.food.count --;
        }
      }
    }
  };
</script>

<style lang='stylus' rel='stylesheet/stylus'>
  .cartcontrol
    font-size :0
    .cart-decrease
      display :inline-block
      padding :6px
      transition :all 0.4s linear
      &.move-transition
        opacity :1
        transform :translate3D(0,0,0)
        .inner
          display :block
          font-size :24px
          line-height :24px
          color :rgb(0,160,220)
          transition :all 0.3s linear
          transform :rotate(0)
      &.move-enter,&.move-leave
        opacity :0
        transform :translate3D(24px,0,0)
        .inner
          transform :rotate(180deg)
    .cart-count
      display :inline-block
      vertical-align :top
      font-size :10px
      text-align :center
      color: #7e8c8d
      line-height :24px
      width: 12px
      padding-top: 6px
      font-weight :700
    .cart-add
      display :inline-block
      padding :6px
      font-size :24px
      line-height :24px
      color :rgb(0,160,220)
</style>
